你能颠倒布兰卡色彩图的顺序吗？

Question

我有一个 branca 颜色图，可以翻转它的顺序吗？

例如这个：

为此：

代码：

import branca.colormap as cm
den_colormap = cm.linear.RdBu_11

Answer 1

cm.linear 是 LinearColormap 个实例的集合。
LinearColormap 具有颜色列表 colors 以及最小值 vmin 和最大值 vmax 作为属性，即用于将值线性映射到颜色。
LinearColormap 初始化程序将颜色列表以及最小值和最大值作为参数。

Source

因此，您可以根据现有实例创建一个新的 LinearColormap 实例，方法是传递颠倒的颜色列表并使用相同的最小值和最大值。

def reversed_colormap(existing):
    return cm.LinearColormap(
        colors=list(reversed(existing.colors)),
        vmin=existing.vmin, vmax=existing.vmax
    )

示例：

RdBu_11_reverse = reversed_colormap(cm.linear.RdBu_11)

Answer 2

试试这个：

import branca.colormap as cm

den_colormap = cm.linear.RdBu_11.colors
print('Original : \n', den_colormap)

den_colormap.reverse()
print('reversed : \n', den_colormap)

out = cm.LinearColormap(colors=den_colormap)
print('out : \n', out.colors)

输出：

Original : 
 [(0.403921568627451, 0.0, 0.12156862745098039, 1.0), (0.6980392156862745, 0.09411764705882353, 0.16862745098039217, 1.0), (0.8392156862745098, 0.3764705882352941, 0.30196078431372547, 1.0), (0.9568627450980393, 0.6470588235294118, 0.5098039215686274, 1.0), (0.9921568627450981, 0.8588235294117647, 0.7803921568627451, 1.0), (0.9686274509803922, 0.9686274509803922, 0.9686274509803922, 1.0), (0.8196078431372549, 0.8980392156862745, 0.9411764705882353, 1.0), (0.5725490196078431, 0.7725490196078432, 0.8705882352941177, 1.0), (0.2627450980392157, 0.5764705882352941, 0.7647058823529411, 1.0), (0.12941176470588237, 0.4, 0.6745098039215687, 1.0), (0.0196078431372549, 0.18823529411764706, 0.3803921568627451, 1.0)]

reversed : 
 [(0.0196078431372549, 0.18823529411764706, 0.3803921568627451, 1.0), (0.12941176470588237, 0.4, 0.6745098039215687, 1.0), (0.2627450980392157, 0.5764705882352941, 0.7647058823529411, 1.0), (0.5725490196078431, 0.7725490196078432, 0.8705882352941177, 1.0), (0.8196078431372549, 0.8980392156862745, 0.9411764705882353, 1.0), (0.9686274509803922, 0.9686274509803922, 0.9686274509803922, 1.0), (0.9921568627450981, 0.8588235294117647, 0.7803921568627451, 1.0), (0.9568627450980393, 0.6470588235294118, 0.5098039215686274, 1.0), (0.8392156862745098, 0.3764705882352941, 0.30196078431372547, 1.0), (0.6980392156862745, 0.09411764705882353, 0.16862745098039217, 1.0), (0.403921568627451, 0.0, 0.12156862745098039, 1.0)]

out : 
 [(0.0196078431372549, 0.18823529411764706, 0.3803921568627451, 1.0), (0.12941176470588237, 0.4, 0.6745098039215687, 1.0), (0.2627450980392157, 0.5764705882352941, 0.7647058823529411, 1.0), (0.5725490196078431, 0.7725490196078432, 0.8705882352941177, 1.0), (0.8196078431372549, 0.8980392156862745, 0.9411764705882353, 1.0), (0.9686274509803922, 0.9686274509803922, 0.9686274509803922, 1.0), (0.9921568627450981, 0.8588235294117647, 0.7803921568627451, 1.0), (0.9568627450980393, 0.6470588235294118, 0.5098039215686274, 1.0), (0.8392156862745098, 0.3764705882352941, 0.30196078431372547, 1.0), (0.6980392156862745, 0.09411764705882353, 0.16862745098039217, 1.0), (0.403921568627451, 0.0, 0.12156862745098039, 1.0)]

你能颠倒布兰卡色彩图的顺序吗？

Can you reverse the order of a branca colormap?

python

colormap